Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 2a5faf80ab3de76d5577d0d3d883fb1b9ba7afdc863b00f73929015ad1d341f0:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

error: pre-condition failed: listing has already been purchased
   --> 4eb8a10cb9f87357.NFTStorefront:243:16